sys/ofed/drivers/infiniband/ulp/ipoib/ipoib_ib.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
   3  *
   4  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   5  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   6  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   7  * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
   8  *
   9  * This software is available to you under a choice of one of two
  10  * licenses.  You may choose to be licensed under the terms of the GNU
  11  * General Public License (GPL) Version 2, available from the file
  12  * COPYING in the main directory of this source tree, or the
  13  * OpenIB.org BSD license below:
  14  *
  15  *     Redistribution and use in source and binary forms, with or
  16  *     without modification, are permitted provided that the following
  17  *     conditions are met:
  18  *
  19  *      - Redistributions of source code must retain the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer.
  22  *
  23  *      - Redistributions in binary form must reproduce the above
  24  *        copyright notice, this list of conditions and the following
  25  *        disclaimer in the documentation and/or other materials
  26  *        provided with the distribution.
  27  *
  28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  32  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  33  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  34  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  35  * SOFTWARE.
  36  */
  37
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  40
  41 #include "ipoib.h"
  42
  43 #include <rdma/ib_cache.h>
  44
  45 #include <security/mac/mac_framework.h>
  46
  47 #include <linux/delay.h>
  48 #include <linux/dma-mapping.h>
  49
  50 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  51 static int data_debug_level;
  52
  53 module_param(data_debug_level, int, 0644);
  54 MODULE_PARM_DESC(data_debug_level,
  55                  "Enable data path debug tracing if > 0");
  56 #endif
  57
  58 static DEFINE_MUTEX(pkey_mutex);
  59
  60 struct ipoib_ah *ipoib_create_ah(struct ipoib_dev_priv *priv,
  61                                  struct ib_pd *pd, struct ib_ah_attr *attr)
  62 {
  63         struct ipoib_ah *ah;
  64
  65         ah = kmalloc(sizeof *ah, GFP_KERNEL);
  66         if (!ah)
  67                 return NULL;
  68
  69         ah->priv      = priv;
  70         ah->last_send = 0;
  71         kref_init(&ah->ref);
  72
  73         ah->ah = ib_create_ah(pd, attr);
  74         if (IS_ERR(ah->ah)) {
  75                 kfree(ah);
  76                 ah = NULL;
  77         } else
  78                 ipoib_dbg(priv, "Created ah %p\n", ah->ah);
  79
  80         return ah;
  81 }
  82
  83 void ipoib_free_ah(struct kref *kref)
  84 {
  85         struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
  86         struct ipoib_dev_priv *priv = ah->priv;
  87
  88         unsigned long flags;
  89
  90         spin_lock_irqsave(&priv->lock, flags);
  91         list_add_tail(&ah->list, &priv->dead_ahs);
  92         spin_unlock_irqrestore(&priv->lock, flags);
  93 }
  94
  95 void
  96 ipoib_dma_unmap_rx(struct ipoib_dev_priv *priv, struct ipoib_rx_buf *rx_req)
  97 {
  98         struct mbuf *m;
  99         int i;
 100
 101         for (i = 0, m = rx_req->mb; m != NULL; m = m->m_next, i++)
 102                 ib_dma_unmap_single(priv->ca, rx_req->mapping[i], m->m_len,
 103                     DMA_FROM_DEVICE);
 104 }
 105
 106 void
 107 ipoib_dma_mb(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int length)
 108 {
 109
 110         m_adj(mb, -(mb->m_pkthdr.len - length));
 111 }
 112
 113 struct mbuf *
 114 ipoib_alloc_map_mb(struct ipoib_dev_priv *priv, struct ipoib_rx_buf *rx_req,
 115     int align, int size, int max_frags)
 116 {
 117         struct mbuf *mb, *m;
 118         int i, j;
 119
 120         rx_req->mb = NULL;
 121         mb = m_getm2(NULL, align + size, M_NOWAIT, MT_DATA, M_PKTHDR);
 122         if (mb == NULL)
 123                 return (NULL);
 124         for (i = 0, m = mb; m != NULL; m = m->m_next, i++) {
 125                 MPASS(i < max_frags);
 126
 127                 m->m_len = M_SIZE(m) - align;
 128                 m->m_data += align;
 129                 align = 0;
 130                 mb->m_pkthdr.len += m->m_len;
 131                 rx_req->mapping[i] = ib_dma_map_single(priv->ca,
 132                     mtod(m, void *), m->m_len, DMA_FROM_DEVICE);
 133                 if (unlikely(ib_dma_mapping_error(priv->ca,
 134                     rx_req->mapping[i])))
 135                         goto error;
 136
 137         }
 138         rx_req->mb = mb;
 139         return (mb);
 140 error:
 141         for (j = 0, m = mb; j < i; m = m->m_next, j++)
 142                 ib_dma_unmap_single(priv->ca, rx_req->mapping[j], m->m_len,
 143                     DMA_FROM_DEVICE);
 144         m_freem(mb);
 145         return (NULL);
 146
 147 }
 148
 149 static int ipoib_ib_post_receive(struct ipoib_dev_priv *priv, int id)
 150 {
 151         struct ipoib_rx_buf *rx_req;
 152         const struct ib_recv_wr *bad_wr;
 153         struct mbuf *m;
 154         int ret;
 155         int i;
 156
 157         rx_req = &priv->rx_ring[id];
 158         for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) {
 159                 priv->rx_sge[i].addr = rx_req->mapping[i];
 160                 priv->rx_sge[i].length = m->m_len;
 161         }
 162         priv->rx_wr.num_sge = i;
 163         priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
 164
 165         ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
 166         if (unlikely(ret)) {
 167                 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 168                 ipoib_dma_unmap_rx(priv, &priv->rx_ring[id]);
 169                 m_freem(priv->rx_ring[id].mb);
 170                 priv->rx_ring[id].mb = NULL;
 171         }
 172
 173         return ret;
 174 }
 175
 176 static struct mbuf *
 177 ipoib_alloc_rx_mb(struct ipoib_dev_priv *priv, int id)
 178 {
 179         return ipoib_alloc_map_mb(priv, &priv->rx_ring[id],
 180             0, priv->max_ib_mtu + IB_GRH_BYTES, IPOIB_UD_RX_SG);
 181 }
 182
 183 static int ipoib_ib_post_receives(struct ipoib_dev_priv *priv)
 184 {
 185         int i;
 186
 187         for (i = 0; i < ipoib_recvq_size; ++i) {
 188                 if (!ipoib_alloc_rx_mb(priv, i)) {
 189                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 190                         return -ENOMEM;
 191                 }
 192                 if (ipoib_ib_post_receive(priv, i)) {
 193                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 194                         return -EIO;
 195                 }
 196         }
 197
 198         return 0;
 199 }
 200
 201 static void
 202 ipoib_ib_handle_rx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
 203 {
 204         struct ipoib_rx_buf saverx;
 205         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 206         struct ifnet *dev = priv->dev;
 207         struct ipoib_header *eh;
 208         struct mbuf *mb;
 209
 210         ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 211                        wr_id, wc->status);
 212
 213         if (unlikely(wr_id >= ipoib_recvq_size)) {
 214                 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 215                            wr_id, ipoib_recvq_size);
 216                 return;
 217         }
 218
 219         mb  = priv->rx_ring[wr_id].mb;
 220
 221         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 222                 if (wc->status != IB_WC_WR_FLUSH_ERR) {
 223                         ipoib_warn(priv, "failed recv event "
 224                                    "(status=%d, wrid=%d vend_err %x)\n",
 225                                    wc->status, wr_id, wc->vendor_err);
 226                         goto repost;
 227                 }
 228                 if (mb) {
 229                         ipoib_dma_unmap_rx(priv, &priv->rx_ring[wr_id]);
 230                         m_freem(mb);
 231                         priv->rx_ring[wr_id].mb = NULL;
 232                 }
 233                 return;
 234         }
 235
 236         /*
 237          * Drop packets that this interface sent, ie multicast packets
 238          * that the HCA has replicated.
 239          */
 240         if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
 241                 goto repost;
 242
 243         memcpy(&saverx, &priv->rx_ring[wr_id], sizeof(saverx));
 244         /*
 245          * If we can't allocate a new RX buffer, dump
 246          * this packet and reuse the old buffer.
 247          */
 248         if (unlikely(!ipoib_alloc_rx_mb(priv, wr_id))) {
 249                 memcpy(&priv->rx_ring[wr_id], &saverx, sizeof(saverx));
 250                 if_inc_counter(dev, IFCOUNTER_IQDROPS, 1);
 251                 goto repost;
 252         }
 253
 254         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 255                        wc->byte_len, wc->slid);
 256
 257         ipoib_dma_unmap_rx(priv, &saverx);
 258         ipoib_dma_mb(priv, mb, wc->byte_len);
 259
 260         if_inc_counter(dev, IFCOUNTER_IPACKETS, 1);
 261         if_inc_counter(dev, IFCOUNTER_IBYTES, mb->m_pkthdr.len);
 262         mb->m_pkthdr.rcvif = dev;
 263         m_adj(mb, sizeof(struct ib_grh) - INFINIBAND_ALEN);
 264         eh = mtod(mb, struct ipoib_header *);
 265         bzero(eh->hwaddr, 4);   /* Zero the queue pair, only dgid is in grh */
 266
 267         if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
 268                 mb->m_pkthdr.csum_flags = CSUM_IP_CHECKED | CSUM_IP_VALID;
 269
 270         dev->if_input(dev, mb);
 271
 272 repost:
 273         if (unlikely(ipoib_ib_post_receive(priv, wr_id)))
 274                 ipoib_warn(priv, "ipoib_ib_post_receive failed "
 275                            "for buf %d\n", wr_id);
 276 }
 277
 278 int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req, int max)
 279 {
 280         struct mbuf *mb = tx_req->mb;
 281         u64 *mapping = tx_req->mapping;
 282         struct mbuf *m, *p;
 283         int error;
 284         int i;
 285
 286         for (m = mb, p = NULL, i = 0; m != NULL; p = m, m = m->m_next, i++) {
 287                 if (m->m_len != 0)
 288                         continue;
 289                 if (p == NULL)
 290                         panic("ipoib_dma_map_tx: First mbuf empty\n");
 291                 p->m_next = m_free(m);
 292                 m = p;
 293                 i--;
 294         }
 295         i--;
 296         if (i >= max) {
 297                 tx_req->mb = mb = m_defrag(mb, M_NOWAIT);
 298                 if (mb == NULL)
 299                         return -EIO;
 300                 for (m = mb, i = 0; m != NULL; m = m->m_next, i++);
 301                 if (i >= max)
 302                         return -EIO;
 303         }
 304         error = 0;
 305         for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
 306                 mapping[i] = ib_dma_map_single(ca, mtod(m, void *),
 307                                                m->m_len, DMA_TO_DEVICE);
 308                 if (unlikely(ib_dma_mapping_error(ca, mapping[i]))) {
 309                         error = -EIO;
 310                         break;
 311                 }
 312         }
 313         if (error) {
 314                 int end;
 315
 316                 end = i;
 317                 for (m = mb, i = 0; i < end; m = m->m_next, i++)
 318                         ib_dma_unmap_single(ca, mapping[i], m->m_len,
 319                                             DMA_TO_DEVICE);
 320         }
 321         return error;
 322 }
 323
 324 void ipoib_dma_unmap_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
 325 {
 326         struct mbuf *mb = tx_req->mb;
 327         u64 *mapping = tx_req->mapping;
 328         struct mbuf *m;
 329         int i;
 330
 331         for (m = mb, i = 0; m != NULL; m = m->m_next, i++)
 332                 ib_dma_unmap_single(ca, mapping[i], m->m_len, DMA_TO_DEVICE);
 333 }
 334
 335 static void ipoib_ib_handle_tx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
 336 {
 337         struct ifnet *dev = priv->dev;
 338         unsigned int wr_id = wc->wr_id;
 339         struct ipoib_tx_buf *tx_req;
 340
 341         ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 342                        wr_id, wc->status);
 343
 344         if (unlikely(wr_id >= ipoib_sendq_size)) {
 345                 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 346                            wr_id, ipoib_sendq_size);
 347                 return;
 348         }
 349
 350         tx_req = &priv->tx_ring[wr_id];
 351
 352         ipoib_dma_unmap_tx(priv->ca, tx_req);
 353
 354         if_inc_counter(dev, IFCOUNTER_OPACKETS, 1);
 355
 356         m_freem(tx_req->mb);
 357
 358         ++priv->tx_tail;
 359         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 360             (dev->if_drv_flags & IFF_DRV_OACTIVE) &&
 361             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 362                 dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
 363
 364         if (wc->status != IB_WC_SUCCESS &&
 365             wc->status != IB_WC_WR_FLUSH_ERR)
 366                 ipoib_warn(priv, "failed send event "
 367                            "(status=%d, wrid=%d vend_err %x)\n",
 368                            wc->status, wr_id, wc->vendor_err);
 369 }
 370
 371 int
 372 ipoib_poll_tx(struct ipoib_dev_priv *priv, bool do_start)
 373 {
 374         int n, i;
 375
 376         n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 377         for (i = 0; i < n; ++i) {
 378                 struct ib_wc *wc = priv->send_wc + i;
 379                 if (wc->wr_id & IPOIB_OP_CM)
 380                         ipoib_cm_handle_tx_wc(priv, wc);
 381                 else
 382                         ipoib_ib_handle_tx_wc(priv, wc);
 383         }
 384
 385         if (do_start && n != 0)
 386                 ipoib_start_locked(priv->dev, priv);
 387
 388         return n == MAX_SEND_CQE;
 389 }
 390
 391 static void
 392 ipoib_poll(struct ipoib_dev_priv *priv)
 393 {
 394         int n, i;
 395
 396 poll_more:
 397         spin_lock(&priv->drain_lock);
 398         for (;;) {
 399                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 400                 for (i = 0; i < n; i++) {
 401                         struct ib_wc *wc = priv->ibwc + i;
 402
 403                         if ((wc->wr_id & IPOIB_OP_RECV) == 0)
 404                                 panic("ipoib_poll: Bad wr_id 0x%jX\n",
 405                                     (intmax_t)wc->wr_id);
 406                         if (wc->wr_id & IPOIB_OP_CM)
 407                                 ipoib_cm_handle_rx_wc(priv, wc);
 408                         else
 409                                 ipoib_ib_handle_rx_wc(priv, wc);
 410                 }
 411
 412                 if (n != IPOIB_NUM_WC)
 413                         break;
 414         }
 415         spin_unlock(&priv->drain_lock);
 416
 417         if (ib_req_notify_cq(priv->recv_cq,
 418             IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS) > 0)
 419                 goto poll_more;
 420 }
 421
 422 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 423 {
 424         struct ipoib_dev_priv *priv = dev_ptr;
 425
 426         ipoib_poll(priv);
 427 }
 428
 429 static void drain_tx_cq(struct ipoib_dev_priv *priv)
 430 {
 431         struct ifnet *dev = priv->dev;
 432
 433         spin_lock(&priv->lock);
 434         while (ipoib_poll_tx(priv, true))
 435                 ; /* nothing */
 436
 437         if (dev->if_drv_flags & IFF_DRV_OACTIVE)
 438                 mod_timer(&priv->poll_timer, jiffies + 1);
 439
 440         spin_unlock(&priv->lock);
 441 }
 442
 443 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
 444 {
 445         struct ipoib_dev_priv *priv = dev_ptr;
 446
 447         mod_timer(&priv->poll_timer, jiffies);
 448 }
 449
 450 static inline int
 451 post_send(struct ipoib_dev_priv *priv, unsigned int wr_id,
 452     struct ib_ah *address, u32 qpn, struct ipoib_tx_buf *tx_req, void *head,
 453     int hlen)
 454 {
 455         const struct ib_send_wr *bad_wr;
 456         struct mbuf *mb = tx_req->mb;
 457         u64 *mapping = tx_req->mapping;
 458         struct mbuf *m;
 459         int i;
 460
 461         for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
 462                 priv->tx_sge[i].addr         = mapping[i];
 463                 priv->tx_sge[i].length       = m->m_len;
 464         }
 465         priv->tx_wr.wr.num_sge  = i;
 466         priv->tx_wr.wr.wr_id    = wr_id;
 467         priv->tx_wr.remote_qpn  = qpn;
 468         priv->tx_wr.ah          = address;
 469
 470         if (head) {
 471                 priv->tx_wr.mss         = 0; /* XXX mb_shinfo(mb)->gso_size; */
 472                 priv->tx_wr.header      = head;
 473                 priv->tx_wr.hlen        = hlen;
 474                 priv->tx_wr.wr.opcode   = IB_WR_LSO;
 475         } else
 476                 priv->tx_wr.wr.opcode   = IB_WR_SEND;
 477
 478         return ib_post_send(priv->qp, &priv->tx_wr.wr, &bad_wr);
 479 }
 480
 481 void
 482 ipoib_send(struct ipoib_dev_priv *priv, struct mbuf *mb,
 483     struct ipoib_ah *address, u32 qpn)
 484 {
 485         struct ifnet *dev = priv->dev;
 486         struct ipoib_tx_buf *tx_req;
 487         int hlen;
 488         void *phead;
 489
 490         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 491                 while (ipoib_poll_tx(priv, false))
 492                         ; /* nothing */
 493
 494         m_adj(mb, sizeof (struct ipoib_pseudoheader));
 495         if (0 /* XXX segment offload mb_is_gso(mb) */) {
 496                 /* XXX hlen = mb_transport_offset(mb) + tcp_hdrlen(mb); */
 497                 phead = mtod(mb, void *);
 498                 if (mb->m_len < hlen) {
 499                         ipoib_warn(priv, "linear data too small\n");
 500                         if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 501                         m_freem(mb);
 502                         return;
 503                 }
 504                 m_adj(mb, hlen);
 505         } else {
 506                 if (unlikely(mb->m_pkthdr.len - IPOIB_ENCAP_LEN > priv->mcast_mtu)) {
 507                         ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 508                                    mb->m_pkthdr.len, priv->mcast_mtu);
 509                         if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 510                         ipoib_cm_mb_too_long(priv, mb, priv->mcast_mtu);
 511                         return;
 512                 }
 513                 phead = NULL;
 514                 hlen  = 0;
 515         }
 516
 517         ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 518                        mb->m_pkthdr.len, address, qpn);
 519
 520         /*
 521          * We put the mb into the tx_ring _before_ we call post_send()
 522          * because it's entirely possible that the completion handler will
 523          * run before we execute anything after the post_send().  That
 524          * means we have to make sure everything is properly recorded and
 525          * our state is consistent before we call post_send().
 526          */
 527         tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 528         tx_req->mb = mb;
 529         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req, IPOIB_UD_TX_SG))) {
 530                 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 531                 if (tx_req->mb)
 532                         m_freem(tx_req->mb);
 533                 return;
 534         }
 535
 536         if (mb->m_pkthdr.csum_flags & (CSUM_IP|CSUM_TCP|CSUM_UDP))
 537                 priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
 538         else
 539                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 540
 541         if (++priv->tx_outstanding == ipoib_sendq_size) {
 542                 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 543                 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 544                         ipoib_warn(priv, "request notify on send CQ failed\n");
 545                 dev->if_drv_flags |= IFF_DRV_OACTIVE;
 546         }
 547
 548         if (unlikely(post_send(priv,
 549             priv->tx_head & (ipoib_sendq_size - 1), address->ah, qpn,
 550             tx_req, phead, hlen))) {
 551                 ipoib_warn(priv, "post_send failed\n");
 552                 if_inc_counter(dev, IFCOUNTER_OERRORS, 1);
 553                 --priv->tx_outstanding;
 554                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 555                 m_freem(mb);
 556                 if (dev->if_drv_flags & IFF_DRV_OACTIVE)
 557                         dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
 558         } else {
 559                 address->last_send = priv->tx_head;
 560                 ++priv->tx_head;
 561         }
 562 }
 563
 564 static void __ipoib_reap_ah(struct ipoib_dev_priv *priv)
 565 {
 566         struct ipoib_ah *ah, *tah;
 567         LIST_HEAD(remove_list);
 568         unsigned long flags;
 569
 570         spin_lock_irqsave(&priv->lock, flags);
 571
 572         list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 573                 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 574                         list_del(&ah->list);
 575                         ib_destroy_ah(ah->ah);
 576                         kfree(ah);
 577                 }
 578
 579         spin_unlock_irqrestore(&priv->lock, flags);
 580 }
 581
 582 void ipoib_reap_ah(struct work_struct *work)
 583 {
 584         struct ipoib_dev_priv *priv =
 585                 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 586
 587         __ipoib_reap_ah(priv);
 588
 589         if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 590                 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
 591                                    HZ);
 592 }
 593
 594 static void ipoib_ah_dev_cleanup(struct ipoib_dev_priv *priv)
 595 {
 596         unsigned long begin;
 597
 598         begin = jiffies;
 599
 600         while (!list_empty(&priv->dead_ahs)) {
 601                 __ipoib_reap_ah(priv);
 602
 603                 if (time_after(jiffies, begin + HZ)) {
 604                         ipoib_warn(priv, "timing out; will leak address handles\n");
 605                         break;
 606                 }
 607
 608                 msleep(1);
 609         }
 610 }
 611
 612 static void ipoib_ib_tx_timer_func(unsigned long ctx)
 613 {
 614         drain_tx_cq((struct ipoib_dev_priv *)ctx);
 615 }
 616
 617 int ipoib_ib_dev_open(struct ipoib_dev_priv *priv)
 618 {
 619         int ret;
 620
 621         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
 622                 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
 623                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 624                 return -1;
 625         }
 626         set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 627
 628         ret = ipoib_init_qp(priv);
 629         if (ret) {
 630                 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 631                 return -1;
 632         }
 633
 634         ret = ipoib_ib_post_receives(priv);
 635         if (ret) {
 636                 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 637                 ipoib_ib_dev_stop(priv, 1);
 638                 return -1;
 639         }
 640
 641         ret = ipoib_cm_dev_open(priv);
 642         if (ret) {
 643                 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 644                 ipoib_ib_dev_stop(priv, 1);
 645                 return -1;
 646         }
 647
 648         clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 649         queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
 650
 651         set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 652
 653         return 0;
 654 }
 655
 656 static void ipoib_pkey_dev_check_presence(struct ipoib_dev_priv *priv)
 657 {
 658         u16 pkey_index = 0;
 659
 660         if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 661                 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 662         else
 663                 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 664 }
 665
 666 int ipoib_ib_dev_up(struct ipoib_dev_priv *priv)
 667 {
 668
 669         ipoib_pkey_dev_check_presence(priv);
 670
 671         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 672                 ipoib_dbg(priv, "PKEY is not assigned.\n");
 673                 return 0;
 674         }
 675
 676         set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 677
 678         return ipoib_mcast_start_thread(priv);
 679 }
 680
 681 int ipoib_ib_dev_down(struct ipoib_dev_priv *priv, int flush)
 682 {
 683
 684         ipoib_dbg(priv, "downing ib_dev\n");
 685
 686         clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 687         if_link_state_change(priv->dev, LINK_STATE_DOWN);
 688
 689         /* Shutdown the P_Key thread if still active */
 690         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 691                 mutex_lock(&pkey_mutex);
 692                 set_bit(IPOIB_PKEY_STOP, &priv->flags);
 693                 cancel_delayed_work(&priv->pkey_poll_task);
 694                 mutex_unlock(&pkey_mutex);
 695                 if (flush)
 696                         flush_workqueue(ipoib_workqueue);
 697         }
 698
 699         ipoib_mcast_stop_thread(priv, flush);
 700         ipoib_mcast_dev_flush(priv);
 701
 702         ipoib_flush_paths(priv);
 703
 704         return 0;
 705 }
 706
 707 static int recvs_pending(struct ipoib_dev_priv *priv)
 708 {
 709         int pending = 0;
 710         int i;
 711
 712         for (i = 0; i < ipoib_recvq_size; ++i)
 713                 if (priv->rx_ring[i].mb)
 714                         ++pending;
 715
 716         return pending;
 717 }
 718
 719 static void check_qp_movement_and_print(struct ipoib_dev_priv *priv,
 720                                         struct ib_qp *qp,
 721                                         enum ib_qp_state new_state)
 722 {
 723         struct ib_qp_attr qp_attr;
 724         struct ib_qp_init_attr query_init_attr;
 725         int ret;
 726
 727         ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr);
 728         if (ret) {
 729                 ipoib_warn(priv, "%s: Failed to query QP (%d)\n", __func__, ret);
 730                 return;
 731         }
 732
 733         /* print according to the new-state and the previous state */
 734         if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET) {
 735                 ipoib_dbg(priv, "Failed to modify QP %d->%d, acceptable\n",
 736                           qp_attr.qp_state, new_state);
 737         } else {
 738                 ipoib_warn(priv, "Failed to modify QP %d->%d\n",
 739                            qp_attr.qp_state, new_state);
 740         }
 741 }
 742
 743 void ipoib_drain_cq(struct ipoib_dev_priv *priv)
 744 {
 745         int i, n;
 746
 747         spin_lock(&priv->drain_lock);
 748         do {
 749                 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 750                 for (i = 0; i < n; ++i) {
 751                         /*
 752                          * Convert any successful completions to flush
 753                          * errors to avoid passing packets up the
 754                          * stack after bringing the device down.
 755                          */
 756                         if (priv->ibwc[i].status == IB_WC_SUCCESS)
 757                                 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 758
 759                         if ((priv->ibwc[i].wr_id & IPOIB_OP_RECV) == 0)
 760                                 panic("ipoib_drain_cq:  Bad wrid 0x%jX\n",
 761                                     (intmax_t)priv->ibwc[i].wr_id);
 762                         if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 763                                 ipoib_cm_handle_rx_wc(priv, priv->ibwc + i);
 764                         else
 765                                 ipoib_ib_handle_rx_wc(priv, priv->ibwc + i);
 766                 }
 767         } while (n == IPOIB_NUM_WC);
 768         spin_unlock(&priv->drain_lock);
 769
 770         spin_lock(&priv->lock);
 771         while (ipoib_poll_tx(priv, true))
 772                 ; /* nothing */
 773
 774         spin_unlock(&priv->lock);
 775 }
 776
 777 int ipoib_ib_dev_stop(struct ipoib_dev_priv *priv, int flush)
 778 {
 779         struct ib_qp_attr qp_attr;
 780         unsigned long begin;
 781         struct ipoib_tx_buf *tx_req;
 782         int i;
 783
 784         clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 785
 786         ipoib_cm_dev_stop(priv);
 787
 788         /*
 789          * Move our QP to the error state and then reinitialize in
 790          * when all work requests have completed or have been flushed.
 791          */
 792         qp_attr.qp_state = IB_QPS_ERR;
 793         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 794                 check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR);
 795
 796         /* Wait for all sends and receives to complete */
 797         begin = jiffies;
 798
 799         while (priv->tx_head != priv->tx_tail || recvs_pending(priv)) {
 800                 if (time_after(jiffies, begin + 5 * HZ)) {
 801                         ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
 802                                    priv->tx_head - priv->tx_tail, recvs_pending(priv));
 803
 804                         /*
 805                          * assume the HW is wedged and just free up
 806                          * all our pending work requests.
 807                          */
 808                         while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
 809                                 tx_req = &priv->tx_ring[priv->tx_tail &
 810                                                         (ipoib_sendq_size - 1)];
 811                                 ipoib_dma_unmap_tx(priv->ca, tx_req);
 812                                 m_freem(tx_req->mb);
 813                                 ++priv->tx_tail;
 814                                 --priv->tx_outstanding;
 815                         }
 816
 817                         for (i = 0; i < ipoib_recvq_size; ++i) {
 818                                 struct ipoib_rx_buf *rx_req;
 819
 820                                 rx_req = &priv->rx_ring[i];
 821                                 if (!rx_req->mb)
 822                                         continue;
 823                                 ipoib_dma_unmap_rx(priv, &priv->rx_ring[i]);
 824                                 m_freem(rx_req->mb);
 825                                 rx_req->mb = NULL;
 826                         }
 827
 828                         goto timeout;
 829                 }
 830
 831                 ipoib_drain_cq(priv);
 832
 833                 msleep(1);
 834         }
 835
 836         ipoib_dbg(priv, "All sends and receives done.\n");
 837
 838 timeout:
 839         del_timer_sync(&priv->poll_timer);
 840         qp_attr.qp_state = IB_QPS_RESET;
 841         if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 842                 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 843
 844         /* Wait for all AHs to be reaped */
 845         set_bit(IPOIB_STOP_REAPER, &priv->flags);
 846         cancel_delayed_work(&priv->ah_reap_task);
 847         if (flush)
 848                 flush_workqueue(ipoib_workqueue);
 849
 850         ipoib_ah_dev_cleanup(priv);
 851
 852         ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 853
 854         return 0;
 855 }
 856
 857 int ipoib_ib_dev_init(struct ipoib_dev_priv *priv, struct ib_device *ca, int port)
 858 {
 859         struct ifnet *dev = priv->dev;
 860
 861         priv->ca = ca;
 862         priv->port = port;
 863         priv->qp = NULL;
 864
 865         if (ipoib_transport_dev_init(priv, ca)) {
 866                 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 867                 return -ENODEV;
 868         }
 869
 870         setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
 871                     (unsigned long) priv);
 872
 873         if (dev->if_flags & IFF_UP) {
 874                 if (ipoib_ib_dev_open(priv)) {
 875                         ipoib_transport_dev_cleanup(priv);
 876                         return -ENODEV;
 877                 }
 878         }
 879
 880         return 0;
 881 }
 882
 883 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 884                                 enum ipoib_flush_level level)
 885 {
 886         struct ipoib_dev_priv *cpriv;
 887         u16 new_index;
 888
 889         mutex_lock(&priv->vlan_mutex);
 890
 891         /*
 892          * Flush any child interfaces too -- they might be up even if
 893          * the parent is down.
 894          */
 895         list_for_each_entry(cpriv, &priv->child_intfs, list)
 896                 __ipoib_ib_dev_flush(cpriv, level);
 897
 898         mutex_unlock(&priv->vlan_mutex);
 899
 900         if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 901                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 902                 return;
 903         }
 904
 905         if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 906                 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 907                 return;
 908         }
 909
 910         if (level == IPOIB_FLUSH_HEAVY) {
 911                 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
 912                         clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 913                         ipoib_ib_dev_down(priv, 0);
 914                         ipoib_ib_dev_stop(priv, 0);
 915                         if (ipoib_pkey_dev_delay_open(priv))
 916                                 return;
 917                 }
 918
 919                 /* restart QP only if P_Key index is changed */
 920                 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
 921                     new_index == priv->pkey_index) {
 922                         ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
 923                         return;
 924                 }
 925                 priv->pkey_index = new_index;
 926         }
 927
 928         if (level == IPOIB_FLUSH_LIGHT) {
 929                 ipoib_mark_paths_invalid(priv);
 930                 ipoib_mcast_dev_flush(priv);
 931         }
 932
 933         if (level >= IPOIB_FLUSH_NORMAL)
 934                 ipoib_ib_dev_down(priv, 0);
 935
 936         if (level == IPOIB_FLUSH_HEAVY) {
 937                 ipoib_ib_dev_stop(priv, 0);
 938                 ipoib_ib_dev_open(priv);
 939         }
 940
 941         /*
 942          * The device could have been brought down between the start and when
 943          * we get here, don't bring it back up if it's not configured up
 944          */
 945         if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 946                 if (level >= IPOIB_FLUSH_NORMAL)
 947                         ipoib_ib_dev_up(priv);
 948                 ipoib_mcast_restart_task(&priv->restart_task);
 949         }
 950 }
 951
 952 void ipoib_ib_dev_flush_light(struct work_struct *work)
 953 {
 954         struct ipoib_dev_priv *priv =
 955                 container_of(work, struct ipoib_dev_priv, flush_light);
 956
 957         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
 958 }
 959
 960 void ipoib_ib_dev_flush_normal(struct work_struct *work)
 961 {
 962         struct ipoib_dev_priv *priv =
 963                 container_of(work, struct ipoib_dev_priv, flush_normal);
 964
 965         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
 966 }
 967
 968 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
 969 {
 970         struct ipoib_dev_priv *priv =
 971                 container_of(work, struct ipoib_dev_priv, flush_heavy);
 972
 973         __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
 974 }
 975
 976 void ipoib_ib_dev_cleanup(struct ipoib_dev_priv *priv)
 977 {
 978
 979         ipoib_dbg(priv, "cleaning up ib_dev\n");
 980
 981         ipoib_mcast_stop_thread(priv, 1);
 982         ipoib_mcast_dev_flush(priv);
 983
 984         ipoib_ah_dev_cleanup(priv);
 985         ipoib_transport_dev_cleanup(priv);
 986 }
 987
 988 /*
 989  * Delayed P_Key Assigment Interim Support
 990  *
 991  * The following is initial implementation of delayed P_Key assigment
 992  * mechanism. It is using the same approach implemented for the multicast
 993  * group join. The single goal of this implementation is to quickly address
 994  * Bug #2507. This implementation will probably be removed when the P_Key
 995  * change async notification is available.
 996  */
 997
 998 void ipoib_pkey_poll(struct work_struct *work)
 999 {
1000         struct ipoib_dev_priv *priv =
1001                 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1002
1003         ipoib_pkey_dev_check_presence(priv);
1004
1005         if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1006                 ipoib_open(priv);
1007         else {
1008                 mutex_lock(&pkey_mutex);
1009                 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1010                         queue_delayed_work(ipoib_workqueue,
1011                                            &priv->pkey_poll_task,
1012                                            HZ);
1013                 mutex_unlock(&pkey_mutex);
1014         }
1015 }
1016
1017 int ipoib_pkey_dev_delay_open(struct ipoib_dev_priv *priv)
1018 {
1019
1020         /* Look for the interface pkey value in the IB Port P_Key table and */
1021         /* set the interface pkey assigment flag                            */
1022         ipoib_pkey_dev_check_presence(priv);
1023
1024         /* P_Key value not assigned yet - start polling */
1025         if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1026                 mutex_lock(&pkey_mutex);
1027                 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1028                 queue_delayed_work(ipoib_workqueue,
1029                                    &priv->pkey_poll_task,
1030                                    HZ);
1031                 mutex_unlock(&pkey_mutex);
1032                 return 1;
1033         }
1034
1035         return 0;
1036 }